All AP Physics C Electricity Resources
Example Questions
Example Question #1 : Electromagnetism
A wire loop of area is placed in a magnetic field whose magnitude varies with time according to the equation
. The loop is held in place, perpendicular to the field. If the wire has resistance
, what is the magnitude of the maximum instantaneous current induced in the loop?
Possible Answers:
Correct answer:
Explanation:
Relevant equations:
Write the expression for the flux using the given expression for the magnetic field strength:
Take the derivative of this flux to find the induced emf:
Determine the maximum value of , and replace
with this value, to find the maximum induced emf:
Plug this maximum induced emf into , to find the maximum induced current:
Gregory
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All AP Physics C Electricity Resources
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